From: Daeho Jeong <[email protected]>
As checkpoint=merge comes in, mount option setting related to checkpoint
had been mixed up and it became hard to understand. So, I separated
this option from "checkpoint=" and made another mount option
"checkpoint_merge" for this.
Signed-off-by: Daeho Jeong <[email protected]>
---
v2: renamed "checkpoint=merge" to "checkpoint_merge"
v3: removed "nocheckpoint_merge" option
v4: re-added "nocheckpoint_merge" option to make it possible to disable
just only "checkpoint_merge" when remount
---
Documentation/filesystems/f2fs.rst | 6 +++---
fs/f2fs/super.c | 25 +++++++++++++------------
2 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index d0ead45dc706..475994ed8b15 100644
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -247,9 +247,9 @@ checkpoint=%s[:%u[%]] Set to "disable" to turn off checkpointing. Set to "enabl
hide up to all remaining free space. The actual space that
would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
This space is reclaimed once checkpoint=enable.
- Here is another option "merge", which creates a kernel daemon
- and makes it to merge concurrent checkpoint requests as much
- as possible to eliminate redundant checkpoint issues. Plus,
+checkpoint_merge When checkpoint is enabled, this can be used to create a kernel
+ daemon and make it to merge concurrent checkpoint requests as
+ much as possible to eliminate redundant checkpoint issues. Plus,
we can eliminate the sluggish issue caused by slow checkpoint
operation when the checkpoint is done in a process context in
a cgroup having low i/o budget and cpu shares. To make this
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 56696f6cfa86..f1791b9c1eac 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -145,6 +145,7 @@ enum {
Opt_checkpoint_disable_cap_perc,
Opt_checkpoint_enable,
Opt_checkpoint_merge,
+ Opt_nocheckpoint_merge,
Opt_compress_algorithm,
Opt_compress_log_size,
Opt_compress_extension,
@@ -215,7 +216,8 @@ static match_table_t f2fs_tokens = {
{Opt_checkpoint_disable_cap, "checkpoint=disable:%u"},
{Opt_checkpoint_disable_cap_perc, "checkpoint=disable:%u%%"},
{Opt_checkpoint_enable, "checkpoint=enable"},
- {Opt_checkpoint_merge, "checkpoint=merge"},
+ {Opt_checkpoint_merge, "checkpoint_merge"},
+ {Opt_nocheckpoint_merge, "nocheckpoint_merge"},
{Opt_compress_algorithm, "compress_algorithm=%s"},
{Opt_compress_log_size, "compress_log_size=%u"},
{Opt_compress_extension, "compress_extension=%s"},
@@ -946,6 +948,9 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
case Opt_checkpoint_merge:
set_opt(sbi, MERGE_CHECKPOINT);
break;
+ case Opt_nocheckpoint_merge:
+ clear_opt(sbi, MERGE_CHECKPOINT);
+ break;
#ifdef CONFIG_F2FS_FS_COMPRESSION
case Opt_compress_algorithm:
if (!f2fs_sb_has_compression(sbi)) {
@@ -1142,12 +1147,6 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
return -EINVAL;
}
- if (test_opt(sbi, DISABLE_CHECKPOINT) &&
- test_opt(sbi, MERGE_CHECKPOINT)) {
- f2fs_err(sbi, "checkpoint=merge cannot be used with checkpoint=disable\n");
- return -EINVAL;
- }
-
/* Not pass down write hints if the number of active logs is lesser
* than NR_CURSEG_PERSIST_TYPE.
*/
@@ -1782,7 +1781,7 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
seq_printf(seq, ",checkpoint=disable:%u",
F2FS_OPTION(sbi).unusable_cap);
if (test_opt(sbi, MERGE_CHECKPOINT))
- seq_puts(seq, ",checkpoint=merge");
+ seq_puts(seq, ",checkpoint_merge");
if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_POSIX)
seq_printf(seq, ",fsync_mode=%s", "posix");
else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
@@ -2066,9 +2065,8 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
}
}
- if (!test_opt(sbi, MERGE_CHECKPOINT)) {
- f2fs_stop_ckpt_thread(sbi);
- } else {
+ if (!test_opt(sbi, DISABLE_CHECKPOINT) &&
+ test_opt(sbi, MERGE_CHECKPOINT)) {
err = f2fs_start_ckpt_thread(sbi);
if (err) {
f2fs_err(sbi,
@@ -2076,6 +2074,8 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
err);
goto restore_gc;
}
+ } else {
+ f2fs_stop_ckpt_thread(sbi);
}
/*
@@ -3831,7 +3831,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
/* setup checkpoint request control and start checkpoint issue thread */
f2fs_init_ckpt_req_control(sbi);
- if (test_opt(sbi, MERGE_CHECKPOINT)) {
+ if (!test_opt(sbi, DISABLE_CHECKPOINT) &&
+ test_opt(sbi, MERGE_CHECKPOINT)) {
err = f2fs_start_ckpt_thread(sbi);
if (err) {
f2fs_err(sbi,
--
2.30.0.365.g02bc693789-goog
On 2021/2/2 20:57, Daeho Jeong wrote:
> From: Daeho Jeong <[email protected]>
>
> As checkpoint=merge comes in, mount option setting related to checkpoint
> had been mixed up and it became hard to understand. So, I separated
> this option from "checkpoint=" and made another mount option
> "checkpoint_merge" for this.
>
> Signed-off-by: Daeho Jeong <[email protected]>
> ---
> v2: renamed "checkpoint=merge" to "checkpoint_merge"
> v3: removed "nocheckpoint_merge" option
> v4: re-added "nocheckpoint_merge" option to make it possible to disable
> just only "checkpoint_merge" when remount
> ---
> Documentation/filesystems/f2fs.rst | 6 +++---
> fs/f2fs/super.c | 25 +++++++++++++------------
> 2 files changed, 16 insertions(+), 15 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index d0ead45dc706..475994ed8b15 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -247,9 +247,9 @@ checkpoint=%s[:%u[%]] Set to "disable" to turn off checkpointing. Set to "enabl
> hide up to all remaining free space. The actual space that
> would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
> This space is reclaimed once checkpoint=enable.
> - Here is another option "merge", which creates a kernel daemon
> - and makes it to merge concurrent checkpoint requests as much
> - as possible to eliminate redundant checkpoint issues. Plus,
> +checkpoint_merge When checkpoint is enabled, this can be used to create a kernel
> + daemon and make it to merge concurrent checkpoint requests as
> + much as possible to eliminate redundant checkpoint issues. Plus,
> we can eliminate the sluggish issue caused by slow checkpoint
> operation when the checkpoint is done in a process context in
> a cgroup having low i/o budget and cpu shares. To make this
nocheckpoint_merge?
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 56696f6cfa86..f1791b9c1eac 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -145,6 +145,7 @@ enum {
> Opt_checkpoint_disable_cap_perc,
> Opt_checkpoint_enable,
> Opt_checkpoint_merge,
> + Opt_nocheckpoint_merge,
> Opt_compress_algorithm,
> Opt_compress_log_size,
> Opt_compress_extension,
> @@ -215,7 +216,8 @@ static match_table_t f2fs_tokens = {
> {Opt_checkpoint_disable_cap, "checkpoint=disable:%u"},
> {Opt_checkpoint_disable_cap_perc, "checkpoint=disable:%u%%"},
> {Opt_checkpoint_enable, "checkpoint=enable"},
> - {Opt_checkpoint_merge, "checkpoint=merge"},
> + {Opt_checkpoint_merge, "checkpoint_merge"},
> + {Opt_nocheckpoint_merge, "nocheckpoint_merge"},
> {Opt_compress_algorithm, "compress_algorithm=%s"},
> {Opt_compress_log_size, "compress_log_size=%u"},
> {Opt_compress_extension, "compress_extension=%s"},
> @@ -946,6 +948,9 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> case Opt_checkpoint_merge:
> set_opt(sbi, MERGE_CHECKPOINT);
> break;
> + case Opt_nocheckpoint_merge:
> + clear_opt(sbi, MERGE_CHECKPOINT);
> + break;
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> case Opt_compress_algorithm:
> if (!f2fs_sb_has_compression(sbi)) {
> @@ -1142,12 +1147,6 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> return -EINVAL;
> }
>
> - if (test_opt(sbi, DISABLE_CHECKPOINT) &&
> - test_opt(sbi, MERGE_CHECKPOINT)) {
> - f2fs_err(sbi, "checkpoint=merge cannot be used with checkpoint=disable\n");
> - return -EINVAL;
> - }
> -
> /* Not pass down write hints if the number of active logs is lesser
> * than NR_CURSEG_PERSIST_TYPE.
> */
> @@ -1782,7 +1781,7 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> seq_printf(seq, ",checkpoint=disable:%u",
> F2FS_OPTION(sbi).unusable_cap);
> if (test_opt(sbi, MERGE_CHECKPOINT))
> - seq_puts(seq, ",checkpoint=merge");
> + seq_puts(seq, ",checkpoint_merge");
else
seq_puts(seq, ",nocheckpoint_merge");
Thanks,
> if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_POSIX)
> seq_printf(seq, ",fsync_mode=%s", "posix");
> else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
> @@ -2066,9 +2065,8 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
> }
> }
>
> - if (!test_opt(sbi, MERGE_CHECKPOINT)) {
> - f2fs_stop_ckpt_thread(sbi);
> - } else {
> + if (!test_opt(sbi, DISABLE_CHECKPOINT) &&
> + test_opt(sbi, MERGE_CHECKPOINT)) {
> err = f2fs_start_ckpt_thread(sbi);
> if (err) {
> f2fs_err(sbi,
> @@ -2076,6 +2074,8 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
> err);
> goto restore_gc;
> }
> + } else {
> + f2fs_stop_ckpt_thread(sbi);
> }
>
> /*
> @@ -3831,7 +3831,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>
> /* setup checkpoint request control and start checkpoint issue thread */
> f2fs_init_ckpt_req_control(sbi);
> - if (test_opt(sbi, MERGE_CHECKPOINT)) {
> + if (!test_opt(sbi, DISABLE_CHECKPOINT) &&
> + test_opt(sbi, MERGE_CHECKPOINT)) {
> err = f2fs_start_ckpt_thread(sbi);
> if (err) {
> f2fs_err(sbi,
>